Stylus-bar mounting



H. E. DAVIS.

STYLUS BAR MOUNTING.

API LICATION FILED AUG.25, 1920.

1,41 3,461. Patented nls 1922.

FIG. 1. V FIG. 3.

IN VEN TOR HOWARD 1 DA v/S ATTO EYS.

UNITED *s 'r HOWARD E. DAVIS, DE LOS AN'G-EL'ES CALIFORNIA.

STYLUS-BAR To all whom it may concern:

Be it known that' I, HOWARD E. DAVIS, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Stylus-Bar Mountings, of which the following is a specification.

'Itis the object of the present invention to provide an improved mounting for the stylus of a sound reproducing machine, saidL mounting forming a spring support for the stylus bar and means for accurately adjusting the position of the stylus bar with V for adjusting the spring tension of its suprelation to the sound box and diaphragm port. p

The invention will be readily understood from the followin description of the ac-' companying drawiiigs, in which Figure 1 is a front elevation of thesound box and stylus bar for ing machine.

Fig. 2 is a bottom plan view of the same. Fig. 3 is a detail section on the line 3-3 of Fig. 1.

Fig. 4 is a similar section on the line a sound reproduc- ,4 4 of Fig. 1.

The sound box upon which the improved stylus mounting is provided may be of any usual .'0nstruct1on including casing 1 having the diaphragm 2 mounted therein.

The mounting for the stylus bar consists of lugs 8 depending from the sound box in circumferentially spaced relation, said lugs being provided with alined half bearings'l;

' The stylus bar: is shown at 5 secured atone end 6 todiaphragm 2 in usual manner. The opposite end of the stylus bar consists of a usual sleeve 7 having a bore 8 arranged to engage the usual stylus 9. The [stylus may lie-retained within bore 8 by means of a set screw 10. I y

The stylus bar intermediate of its ends is adjust-ably mounted with relation to lugs 3, the said adjustable mounting including a spring support for the stylus bar. As an instance of this arrangement a leaf spring extends laterall -from opposite sides of the stylus bar and terminates in bearing lugs 13 arranged to be received in the respective half bearings 4. r j l The leaf spring consists of plates 12 and 12 angularly disposed with relation to one another as clearly shown in Fig. 3. By this arrangement a'spring mounting for the Specification ofLetters Patent. P t t APR Application filed August 25,

, stylus bar mounting for Y curately ad usted.

MOUNTING.

18, 1922. 1920. Serial No. 405,501.

stylus bar is provided which will yield in cross directions, to permit of the necessary yield of the stylus bar with relation to its. mounting. The movement imparted to the by the sound reproducing disc is thus transmitted to the diaphragm 2.

The spring support for the stylus-'baris held in position relative to lugs 3 by means of mechanism adapted to accurately adjust bearinglugs 13 within bearings 4 so as to properly position thestylus bar and adjust the tension ject from opposite sides of bearing lugs 13 1n spaced relation from the lugs 3. These 16-tl1rough which extend set screws 17 having their heads abutting against the walls of-the. slots. -The ends of these set screws are threaded into bores 18 extending through lugs 3. Y i

of its supporting spring. As an instance of .thls arrangement flanges 15 proflanges are provided at their ends with slots By the construction as thus set forth it f will be seen that by adjusting the pairs of set screws 17 at opposite sides of lugs 13 with relation to flanges 15, the spring the stylus bar will be ac springs projecting from opposite sides of bearings :and'means for adjustably position-' V ing-said bearing lugsin said bearings.

3. In asound box, a stylus bar, a tor-' .sional spring passing therethrou'gh, said spring having plurality of wings radially" extending from the longitudinal'ax'is theres of. and means. for supporting the outer ends of said-torsional spring; i

4. The combination with a stylus bar of a torsional "spring extending from the sa'me saidspring having radially extending wings. and means for mounting the ends of said spring.

.Tn testimony whereof I have signed my name to this specification.

HOWARD .E. DAVIS. 

